chore(deps): update semantic_logger requirement from ~> 4.15 to >= 4.15, < 6.0

[dependabot]

Updates the requirements on semantic_logger to permit the latest version.

Changelog

Sourced from semantic_logger's changelog.

[5.1.0] 2026-07-20

Deprecated

These are deprecated now and will be removed in v6. Each emits a Ruby deprecation warning (category: :deprecated), so it is silent by default and shown when deprecation warnings are enabled (for example ruby -W:deprecated, or Rails development mode).

• The :sentry appender (SemanticLogger::Appender::Sentry), which depends on the end-of-life sentry-raven gem. Use the :sentry_ruby appender instead.
• The :new_relic appender (SemanticLogger::Appender::NewRelic), which reports errors via newrelic_rpm. Use the log-forwarding :new_relic_logs appender instead.
• The type: parameter on the Elasticsearch and OpenSearch appenders (:elasticsearch, :elasticsearch_http, and :opensearch). Document _type has been unused since Elasticsearch 7, so the parameter is now ignored on all server versions: the bulk appenders no longer send a _type, and the HTTP appender now posts to _doc.

Fixed

• The file appender opens its log file when it is created, so a misconfigured path or insufficient permissions now raise immediately from SemanticLogger.add_appender, instead of surfacing later on the appender thread via the internal logger while log messages are lost. This restores the pre-4.9 behavior and matches the other appenders, which already open their resources eagerly. As a result the log file is created as soon as the appender is added, even if nothing is logged (the same as the standard Ruby and Rails loggers).

[5.0.0] 2026-06-29

Breaking changes

See the v5.0 upgrading guide for migration details.

• Ruby 3.2 is now the minimum supported runtime. Earlier versions are end-of-life and are no longer tested.
• Consolidate the asynchronous appender proxies: the worker thread and queue now live in an internal SemanticLogger::QueueProcessor, and SemanticLogger::Appender::AsyncBatch has been removed. batch: true now returns a SemanticLogger::Appender::Async (with #batch? true).
• Appenders are now reopened automatically in the child process after fork (and Process.daemon). A Process._fork hook calls SemanticLogger.reopen for you, so most applications no longer need an after_fork/after_worker_boot hook. Disable with SemanticLogger.reopen_on_fork = false. Resolves #338.
• Rename SemanticLogger::Formatters::Base#cleanse to #escape_control_characters. Custom formatters or subclasses that called the old method name must be updated.
• Syslog records now escape control characters by default to prevent log injection. Resolves #190.

New features

• Add opt-in logger caching: SemanticLogger.cache_loggers = true makes SemanticLogger[Class] (and the Loggable mixin) return a single shared Logger instance per class, so a later

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Commits

• ee41292 Merge pull request #381 from reidmorrison/tech-debt/rubocop-todo-burndown
• 3a02e17 Burn down rubocop_todo: set Layout/LineLength to 120, clear four cops
• 13487bd Merge pull request #380 from reidmorrison/tech-debt/legacy-appender-deprecations
• 70bcbfe docs: add v5.1 upgrade notes for switching off deprecated appenders
• 02a2f19 Deprecate legacy service appenders and remove ES type; consolidate async ba...
• cee1b11 Release 5.1.0
• 725262e Merge pull request #379 from reidmorrison/fix/file-appender-eager-open
• 213a697 docs: point the gem's changelog_uri at CHANGELOG.md
• b2f0ba4 fix: open the file appender's log file eagerly at creation
• cd3e84a Merge pull request #378 from reidmorrison/docs/accuracy-review
• Additional commits viewable in compare view

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